87138613 has 8 divisors (see below), whose sum is σ = 90056960. Its totient is φ = 84227040.

The previous prime is 87138587. The next prime is 87138619. The reversal of 87138613 is 31683178.

87138613 is nontrivially palindromic in base 16.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87138613 - 2⁵ = 87138581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87138619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49006 + ... + 50752.

It is an arithmetic number, because the mean of its divisors is an integer number (11257120).

Almost surely, 2^87138613 is an apocalyptic number.

It is an amenable number.

87138613 is a deficient number, since it is larger than the sum of its proper divisors (2918347).

87138613 is a wasteful number, since it uses less digits than its factorization.

87138613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3387.

The product of its digits is 24192, while the sum is 37.

The square root of 87138613 is about 9334.8065325426. The cubic root of 87138613 is about 443.3399632805.

The spelling of 87138613 in words is "eighty-seven million, one hundred thirty-eight thousand, six hundred thirteen".